Two Nucleon-States in a Chiral Quark-Diquark Model

Details Two Nucleon-States in a Chiral Quark-Diquark Model Two Nucleon-States in a Chiral Quark-Diquark Model

2005-06-20

arxiv.org/abs/hep-ph/0506193v2

J.Phys. G32 (2006) 777-786

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 5 figures. Errors are corrected. Conclusions are not affected

Scientific paper

10.1088/0954-3899/32/6/003

We study the ground and first excited states of nucleons in a chiral quark-diquark model. We include two quark-diquark channels of the scalar-isoscalar and axial-vector-isovector types for the nucleon states. The diquark correlation violating the spin-flavor SU(4)$_{SF}$ symmetry allows to treat the two quark-diquark channels independently. Hence the two states appear as the superpositions of the two quark-diquark channels; one is the nucleon and the other is a state which does not appear in the SU(4)$_{SF}$ quark models. With a reasonable choice of model parameters, the mass of the excited state appears at around 1.5 GeV, which we identify with the Roper resonance N(1440).

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